Software Terrorist - The Terror of Code in the Wrong Hands

The 20-to-1 productivity rule says that 5 percent of programmers are 20 times more productive than the remaining 95 percent, but what about the 5 percent at the other end of the bell curve? Consider the software terrorist: the guy who stays up all night, unwittingly but systematically destroying the entire teams last months work while improving the code. He doesnt tell anybody what hes done, and he never tests. Hes created a ticking time bomb that wont be discovered for six months"